Science and Technology. Ping, a pulse of sound in active sonar. Pinging, the noise indicative of improper combustion in internal combustion engines. Ping (Chinese: åª), a Taiwanese measure of area. Ping project, a project of the European Molecular Biology network (EMBnet)
Pre-Market Stock Trading. As its name suggests, pre-market stock trading occurs before the stock market opens up for its regular hours of trading at 9:30 a.m ET. Pre-market stock trading takes place between the hours of 8:00 to 9:30 a.m. ET.
Pre-market futures trade before the regular investment markets open. Different market exchanges specialize in the trade of specific types of futures. For example, the Commodity Exchange in New York specializes in pre-market futures of copper, gold, and silver.